Não informado. (1963). Educational psychologist. American Psychological Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Educational Psychologist. Hillsdale, NJ: American Psychological Association, 1963.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Educational Psychologist. American Psychological Association, 1963.
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